I use this to extract and later calculate the difference between two times.

Simple file names. Special chars allowed (-_.) {3, 40}

match int or float number, and following word (unit for example)

Get Gmail tag, user and domain of an email address. -- Fixed the bug that the label doesn't match if there are an dot on user.

Get src in img

match 00aabbcc... or 00:aa:bb:cc...

Extracts attribute names from an XML file and presents them as a simple list. Affects only the attributes that have values. Ignores the "parent" attributes (that have no values but have nested attributes).

Works on "*youtube.com" urls, as well as "youtu.be" urls

This is a regular expression for date in javascript. It validates the month between 01-12 (double digits only). It validates the day between 01-31 (double digits only). And enforces 4 digit year (no validation for range).

get all words related to regex

Validates an URL of a web page

Regular for testing empty strings for validation purpose

Splits CamelCase single string into separate strings. Can be used for transforming CamelCase to snake_case. Also works with numbers and capital letter shortcuts (e.g SomeWTFVariable1).